The problem with the signal delay is that it is not an absolute time from the launch, but relative to the time you send the command. If I want my probe to perform 3 commands within a 20 second window it will be very hard to do this with the signal delay. This becomes even harder when you have to take signal delay due to distance into account. Creating a second field in the flight computer (or manipulating the current one) to perform commands at a fixed time from T would make queueing a lot easier. I rather stick with RemoteTech than involving other mods for just one piece of functionality